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The car's owners have told 9NEWS it was stolen at 10.30am in Northgate, with one man allegedly threatening a woman with a hammer while two others broke into the vehicle.

"I saw a blue car pull up in the middle of the road and as I turned around and looked through the other side of the window, there was one boy there, smashing my son's back window," a woman, who only wished to be known as Melissa, told 9NEWS.

Police believe another stolen car was used in the robbery.

Police closed Grand Junction Road between Sudholz Road and Fosters Road, and urged motorists to take alternate routes after the crash.